This is the 11th Discworld novel. It was written at the same time as the Bromeliad trilogy and it shows, both works talking about how beings with short life spans live them 'faster' than humans so everyone's lifespan is subjectively about the same, and using mayflies as an example. Unusually, there are two almost completely separate plots, and they are even denoted using two different typefaces (most noticeable in the first hardback edition). The title is a pun on Repo Man.